Microsoft Corp. on Thursday unveiled an overhaul of its Windows operating system built to update the software that long ruled the PC market for an era when the use of apps on smartphones and tablets increasingly dominates people’s interaction with technology.Windows 11, the product’s first new version in almost six years, includes only limited changes to its visual design, but it seeks to reposition the operating system as a hub in a computing universe taking in rival companies’ platforms, including the Android mobile software developed by Google. The new Windows will consist of an app store that collaborates with Amazon.com Inc. which operates its own Android app store-and will let people use their PC with the straightforward interface they have become familiar with on their smartphones.In addition to Windows-based apps, users will be able to choose from android apps Amazon offers to install on their PCs. Amazon offers hundreds of thousands of such apps, including TikTok, the popular video-sharing site, and ride-hailing service Uber Technologies Inc. The partnership would make such apps that have become more central to people’s lives easily accessible on their PC screens.With the new digital storefront, Microsoft is attempting to show itself as a fairer place for developers to distribute their apps, doubling down on its battle with Apple Inc. over costs. Apple maintains strict control over the apps it allows users to install on their iPhones. Microsoft has argued that behavior is anticompetitive and argued for users to have more choice.